2010-10-08 Bernd Schmidt <bernds@codesourcery.com>

Joseph Myers  <joseph@codesourcery.com>

        * configure.in: Handle tic6x targets.
        * configure: Regenerate.
        * tic6x/Makefile.in, tic6x/configure.in, tic6x/crt0.S,
        tic6x/getpid.c, tic6x/kill.c, tic6x/sbrk.c, tic6x/syscalls.c: New.
        * tic6x/configure: New (generated).

libgloss/tic6x/sbrk.c

@@ -0,0 +1,59 @@
+/* sbrk.c -- Implementation of the low-level sbrk() routine
+ *
+ * Copyright (c) 2004 National Semiconductor Corporation
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#include <errno.h>
+#include <stddef.h> /* where ptrdiff_t is defined */
+#include <stdlib.h>
+
+/* Start of the heap.  */
+extern const char _HEAP_START __attribute__((section(".heap")));
+/* End of the heap (maximum value of heap_ptr).  */
+extern const char _HEAP_MAX __attribute__((section(".heap")));
+
+/* Extend heap space by size bytes.
+   Return start of new space allocated, or -1 for errors 
+   Error cases:
+    1. Allocation is not within heap range */
+
+void * sbrk (ptrdiff_t size)
+{
+  /*
+  * The following two memory locations should be defined in the linker script file
+  */
+
+  static const char * heap_ptr;  /* pointer to head of heap */
+  const char * old_heap_ptr;
+  static unsigned char init_sbrk = 0;
+
+  /* heap_ptr is initialized to HEAP_START */
+  if (init_sbrk == 0) 
+  {
+    heap_ptr = &_HEAP_START;
+    init_sbrk = 1;
+  }
+
+  old_heap_ptr = heap_ptr;
+
+  if ((heap_ptr + size) > &_HEAP_MAX)
+  { 
+    /* top of heap is bigger than _HEAP_MAX */
+    errno = ENOMEM;
+    return (void *) -1;
+  }
+
+  /* success: update heap_ptr and return previous value */
+  heap_ptr += size;
+  return (void *)old_heap_ptr;
+}